Physics is my Business

"The video doesn't really start until the 27second mark"

7.1

Momentum

Definition- Momentum is a vector quantity and is the product of the mass and velocity of an object
The equation to find momentum is P=MV
P= Momentum
M= Mass
V= Velocity
Momentum is a conserved quantity, meaning that the total momentum of any closed system cannot change. It is the Inertia of motion. Momentum is a conserved quantity, meaning that the total momentum of any closed system cannot change. It is the Inertia of motion.

7.2

Impulse Changes Momentum

Definition- Product of force and time interval during which the force acts. Impulse equals momentum change.

Impulse = Ft
F= Force
t= time
Impulse is measured in Newtons-Seconds
A force of one Newton applied over one second will change the momentum, a force of two Newton's applied over half of a second will have a similar effect.

7.3

Bouncing

Bouncing simply increases impulse.

7.4

Conservation of Momentum

Definition- the momentum of a system is constant if there are no external forces acting on the system. Newtons first law fits in here.

7.5

Collisions

• Elastic Collisions

Definition- When objects collide without being permanently deformed and without generating heat. No loss of Kinetic energy
The sum of the momentum vectors are the same before and after each collision.
net momentum before collision= net momentum after collision

• Inelastic Collisions

Definition- When objects collide and DOT NOT return to their original shaped. Change of Kinetic Energy
Collisions usually involve external forces which has little impact on the net momentum so it doesn't effect it.
Click here for a demonstration of Elastic and Inelastic Collisions

7.6

Momentum Vectors

Momentum is a vector quantity.
Momentum is conserved even when the object is NOT moving in a straight line.